Pipe bending machine core rod structure for electric vehicle frame production

Abstract

The invention discloses a pipe bending machine core rod structure for electric vehicle frame production, which comprises a core cable, the front end of the core cable is fixedly connected with a limiting head, and an air inlet pipe is arranged in the core cable along the axial direction of the core cable; the core head is provided with a through hole part along the radial direction of the core head, and the core cable penetrates through the through hole part; the air bag is arranged on the periphery of the core cable in a sleeving mode and communicated with the air inlet pipe, and the air bag and the core heads are arranged in a staggered mode; the core cable penetrates through the push rod, the air bag and the core head are located between the limiting head and the push rod, and the limiting head and the push rod are used for limiting the moving distance of the core head. After the core rod is inserted into the pipe, the core head is located at the bent part of the pipe, when the pipe is bent and after bending is completed, the air bag is inflated and deflated, the air bag is expanded and contracted, the core head is driven by the air bag to reciprocate in the radial direction of the pipe, and therefore the supporting range of the core head in the pipe is enlarged; the flatness of the surface of the bent part after the pipe is bent is improved, so that the quality of the produced electric vehicle frame is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe bending machines, and in particular relates to a pipe bending machine core rod structure used for producing electric vehicle frames. Background Art

[0002] The pipe bending machine mainly achieves the purpose of bending by applying a certain force to make the pipe plastically deform in the mold. In the production process of electric vehicle frames, a pipe bending machine is needed to bend and shape the pipes used to produce the frames. In order to prevent the bent part of the pipe from being flattened or wrinkled during the bending process, a mandrel needs to be set inside the pipe for support.

[0003] A Chinese invention patent with publication number CN209206153U discloses a tube bending machine core rod, in which a plurality of rotating beads are connected by a universal ball structure, so that during the tube bending process, the gaps between the plurality of rotating beads supported inside the tube cannot be eliminated, resulting in the tube located at the gaps between the rotating beads not being reliably supported and being sunken, ultimately resulting in an uneven surface of the bent portion of the tube after bending, affecting the quality of the final electric vehicle frame.

[0004] Therefore, it is necessary to improve the core rod structure of the pipe bending machine in the prior art. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects in the prior art and provide a pipe bending machine mandrel structure for the production of electric vehicle frames, which has the effect of improving the flatness of the bending part of the pipe.

[0006] To achieve the above-mentioned purpose, the specific technical scheme of the tube bending machine mandrel structure for electric vehicle frame production of the present invention is as follows: A pipe bending machine core rod structure for producing an electric vehicle frame, comprising: A flexible core cable, the front end of which is fixedly connected to a limiting head, and an air inlet pipe is arranged inside the core cable along its axial direction; A spherical core head is used to support the pipe from the inside, the core head is provided with a perforated portion along its radial direction, and the core cable is arranged through the perforated portion; An annular airbag, which is sleeved on the outer circumference of the core cable and is connected to the air inlet pipe. The airbag and the core head are arranged alternately, and the airbag pushes the core head to move along the axial direction of the tube when inflating and deflation; A tubular push rod, the core cable runs through the push rod, the air bag and the core head are located between the limit head and the push rod, and the limit head and the push rod are used to limit the moving distance of the core head.

[0007] Preferably, in order to store the airbag and allow two adjacent core heads to dock with each other for positioning, the core head is provided with notches connected to the perforated portion at both ends along the axial direction of the perforated portion, wherein the outer diameter of one end is smaller than the inner diameter of the notch on the other end.

[0008] Preferably, in order to enable the spherical surface of the core head to abut against the inner wall of the tube and enhance the supporting effect on the tube, the edges of the two recessed openings are circumferentially distributed with anti-deflection parts, and the anti-deflection parts protrude from the spherical surface of the core head.

[0009] Preferably, in order to make the core cable have better softness and strength, the core cable includes an inner core and an outer skin covering the outer surface of the inner core, and the air inlet pipe is buried inside the outer skin.

[0010] Preferably, in order to prevent the air inlet pipe from being flattened when the core cable is bent, a plurality of support rings are buried inside the outer skin, each of the support rings is coaxially arranged with the inner core and is evenly spaced along the extension direction of the inner core, and the air inlet pipe is passed through the inner side of the support ring.

[0011] Preferably, in order to improve the convenience of inflating and deflating the airbag, the end of the air inlet pipe is connected to the first end of the three-way pipe, and the second end and the third end of the three-way pipe are both provided with valves, and one of the valves is connected to the air pump.

[0012] Preferably, in order to adjust the moving distance of the core head, an adjustment mechanism is provided between the end of the core cable away from the limit head and the push rod, and the adjustment mechanism is used to adjust the interval between the limit head and the push rod.

[0013] Preferably, in order to improve the convenience of adjusting the distance between the limit head and the push rod, the adjustment mechanism includes a base with one end detachably connected to the push rod, a sliding seat is connected to the base along the axial sliding direction of the push rod, the sliding seat is detachably connected to the core cable, and the base is provided with a driving member for driving the sliding seat to move.

[0014] Preferably, in order to improve the stability of the core head positioning, the push rod and the limit head are plugged into and matched with the notch at one end adjacent to the core head.

[0015] Preferably, in order to effectively prevent the core head from deflecting, the anti-deflection member is a ball or a roller.

[0016] The core rod structure of the tube bending machine for producing electric vehicle frames of the present invention has the following advantages: after the core rod is inserted into the interior of the tube, the core head is located at the bending portion of the tube, and when the tube is bent and after the bending is completed, the airbag is inflated and deflated to expand and contract, and the core head is driven to reciprocate along the radial direction of the tube by the airbag, thereby increasing the support range of the core head inside the tube, improving the flatness of the surface of the bending portion after the tube is bent, and thereby improving the quality of the produced electric vehicle frames. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the tube bending machine mandrel of the present invention; Figure 2 It is a schematic diagram of the exploded structure of the tube bending machine core rod of the present invention; Figure 3 It is a structural schematic diagram of the core head of the present invention; Figure 4 is a cross-sectional view of a core head of the present invention; Figure 5 It is a schematic diagram of the structure of the airbag of the present invention; Figure 6 It is a structural schematic diagram of the core cable of the present invention; Figure 7 for Figure 6 A magnified view of part A; Figure 8 It is a structural schematic diagram of the regulating mechanism of the present invention; Explanation of the marks in the figure: 1. core head; 2. air bag; 3. push rod; 4. core cable; 5. adjustment mechanism; 101. notch; 102. perforated portion; 103. ball; 104. groove; 401. limit head; 402. outer skin; 403. inner core; 404. air inlet pipe; 405. plug-in plate; 406. support ring; 407. valve; 408. tee pipe; 501. base; 502. sliding seat; 503. drive member; 504. air pump; 505. slot; 506. collar. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0019] The terms “top surface”, “bottom surface” and “underside surface” are based on the normal use state of the tube bending machine core rod and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0020] like Figure 1-7As shown, a tube bending machine mandrel structure for the production of electric vehicle frames includes: a flexible core cable 4, the front end of the core cable 4 is fixedly connected to a limiting head 401, and an air inlet pipe 404 is arranged inside the core cable 4 along its axial direction; a spherical core head 1, used to support the pipe from the inside, the core head 1 is provided with a perforation 102 along its own radial direction, and the core cable 4 is arranged through the perforation 102; an annular airbag 2, the airbag 2 is sleeved on the outer periphery of the core cable 4 and is connected to the air inlet pipe 404, the airbag 2 and the core head 1 are staggered, and the airbag 2 pushes the core head 1 to move along the axial direction of the pipe when inflated and deflated; a tubular push rod 3, the core cable 4 is arranged through the push rod 3, the airbag 2 and the core head 1 are located between the limiting head 401 and the push rod 3, and the limiting head 401 and the push rod 3 are used to limit the moving distance of the core head 1.

[0021] The mandrel is suitable for supporting the bending part of the pipe from the inside when the pipe is bent by a pipe bender. When in use, the push rod 3, multiple core heads 1 and multiple air bags 2 are all sleeved on the core cable 4, so that each core head 1 and each air bag 2 are located between the limit head 401 and the push rod 3, and an air bag 2 is arranged between two adjacent core heads 1. Before the pipe is bent by the pipe bender, the mandrel needs to be inserted into the pipe as a whole. At this time, the air in all the air bags 2 is discharged to shrink the air bags 2, and at the same time, the push rod 3 is pushed toward the front end along the core cable 4, and each core head 1 and each air bag 2 are clamped from both sides by the push rod 3 and the limit head 401, so that each core head 1 is close to each other. Then, the core rod is placed in a rigid state as a whole, which facilitates the insertion of the core rod into the pipe. During the insertion of the core rod, the length of the push rod 3 located outside the pipe can be measured to control the length of the push rod 3 inserted into the pipe, so that the front end of the push rod 3 is aligned with the end of the pipe where the bending part is required and the relative position between the push rod 3 and the pipe is fixed. Then, the core cable 4 is pushed forward along the push rod 3, and the position of the front end of the core cable 4, that is, the position of the limit head 401, can be controlled by measuring the length of the core cable 4 located outside the push rod 3. At this time, the limit head 401 is aligned with the front end of the pipe where the bending part is required and the relative position of the core cable 4 and the push rod 3 is fixed. 01 and the front end of the push rod 3 corresponds to the length of the bending part of the pipe; at this time, the pipe bender is started to bend the pipe, and during this process, the airbag 2 is inflated and deflated through the air inlet pipe 404, and each airbag 2 is independently controlled to be inflated and deflated through an air inlet pipe 404, so that each core head 1 can be pushed by the airbag 2 to move back and forth along the axial direction of the pipe, thereby increasing the support range of the core head 1 inside the pipe, so that the pipe can be kept flat at all places after bending, and the quality of the pipe bent by the pipe bender is improved; after the pipe is bent, the airbag 2 can still be used to push each core head 1 to move back and forth inside the pipe, so that the bending part of the pipe groove is depressed by the core head 1 The parts are trimmed to improve the flatness of the pipe after bending, and the quality of the pipe after bending by the pipe bender is further guaranteed; when the pipe bender completes bending the pipe, the air inside each airbag 2 is discharged to reduce the friction between the airbag 2 and the inner wall of the pipe, and then the mandrel is pulled out of the pipe as a whole. When taking it out, the push rod 3 and the core cable 4 are fixed to each other, and then the push rod 3 is pulled toward the outside of the pipe. While the push rod 3 moves toward the outside of the pipe, each core head 1 is pulled toward the outside of the pipe through the limit head 401 and the core cable 4. At this time, the core head 1 is in a free rotation state, which can reduce the friction between the core head 1 and the pipe, making it convenient to remove the mandrel from the inside of the pipe.

[0022] Compared with the existing method of connecting each core head by hinge or ball head, the above-mentioned core rod structure can press or loosen each core head 1 through the limit head 401 and the push rod 3 to realize the switching between the rigid state and the free bending state of each core head 1 on the core rod. In the rigid state, it is convenient to insert the core rod into the pipe. In the free bending state, it is convenient for the core rod to bend along the bending shape of the pipe, which greatly improves the convenience of using the core rod. And through the inflation and deflation of the airbag 2, the static and dynamic switching of each core head 1 can be realized. In the static state, by controlling the inflation of different airbags 2 The position of each core head 1 can be freely adjusted, so that each core head 1 can provide better support for the bending part of the pipe; in dynamic state, the support range can be increased by moving the core head 1, and during the movement of the core head 1, the concave part of the pipe can be propped up, so as to achieve the flatness adjustment of the pipe; and when the bending angle of the pipe is large, the interval between the core heads 1 can be adjusted to reduce the mutual interference between the two adjacent core heads 1, thereby ensuring the support effect for the pipe, and the inflated airbag 2 can also provide better support from the inside of the pipe.

[0023] A further improvement is, Figure 3 and 4 As shown, both ends of the core head 1 along the axial direction of the through-hole portion 102 are provided with notches 101 communicating with the through-hole portion 102 , wherein the outer diameter of one end is smaller than the inner diameter of the notch 101 on the other end.

[0024] Specifically, after the airbag 2 shrinks, the ends of the two core heads 1 are butted against each other, so that the two notched portions 101 form a chamber that can accommodate the airbag 2, reducing the probability of the airbag 2 being clamped by the core head 1 and causing damage; when the limiting head 401 and the push rod 3 clamp each core head 1 from both sides, the opposite ends of the two adjacent core heads 1 can be plugged into each other, thereby achieving mutual limitation, so that when the core rod is in a rigid state, the connection between the core heads 1 is more stable, and it is convenient to insert the core rod into the interior of the pipe; and the setting of the notched portion 101 can shorten the axial length of the core head 1 along the perforated portion 102, thereby expanding the movement range of the contact portion between the core head 1 and the inner wall of the pipe, and enhancing the support and correction effect of the core head 1 on the pipe.

[0025] A further improvement is, Figure 3 and 4 As shown, the edges of the openings of the two notches 101 are circumferentially distributed with anti-deflection members, which protrude from the spherical surface of the core head 1 and are balls 103 or rollers.

[0026] Since the core cable 4 is flexible, its supporting and guiding effect on the core head 1 is weak, which makes the core head 1 easily deflected during its movement inside the pipe. During the deflection process, the notch 101 cannot effectively support the inside of the pipe. At this time, bending the pipe will cause the surface of the pipe to sag. Therefore, an anti-deflection member is provided to limit the deflection angle of the core head 1. When the deflection angle of the core head 1 is too large, the anti-deflection member abuts against the inner wall of the pipe to prevent the core head 1 from continuing to deflect, so that the spherical surface of the core head 1 is always in contact with the inner wall of the pipe, ensuring the supporting effect on the pipe. The anti-deflection member is provided as a ball 103 or a roller, which can reduce the friction between the anti-deflection member and the inner wall of the pipe. The core head 1 can move more smoothly inside the pipe, and when the anti-deflection member contacts the inner wall of the pipe, the scratching of the inner wall of the pipe by the deflection member can be reduced. Compared with the roller, the ball 103 is a better implementation method. When installing the ball 103, a plurality of grooves 104 for accommodating the ball 103 are opened on the spherical surface of the core head 1, so that the ball 103 can roll freely inside the groove 104, and the opening diameter of the groove 104 is smaller than the diameter of the ball 103, thereby preventing the ball 103 from falling off. Since the rotation direction of the ball 103 is not restricted, the ball 103 can provide better support and reduce friction when the core head 1 deflects in all directions.

[0027] A further improvement is, Figure 6 As shown, the core cable 4 includes an inner core 403 and an outer skin 402 covering the outer surface of the inner core 403 , and the air inlet pipe 404 is buried inside the outer skin 402 .

[0028] Specifically, the inner core 403 is a steel wire rope, one end of which is fixedly connected to the limit head 401, and the outer skin 402 can be made of polytetrafluoroethylene; the steel wire rope as the inner core 403 can be freely bent, so that the core cable 4 can better adapt to the bending of the pipe, and the strength of the steel wire rope is sufficient, so that the core cable 4 is sufficient to resist the resistance of the core head 1 and remove the core head 1 from the inside of the pipe; the polytetrafluoroethylene outer skin 402 can effectively protect the steel wire rope inner core 403, prevent it from corrosion, and extend the service life of the core cable 4; and the polytetrafluoroethylene outer skin 402 can also have a good lubricating effect to reduce the friction between the core cable 4 and the core head 1 and the push rod 3.

[0029] A further improvement is that, as shown in FIG. 7 , a plurality of support rings 406 are embedded inside the outer skin 402 . Each support ring 406 is coaxially arranged with the inner core 403 and is evenly spaced along the extension direction of the inner core 403 . The air inlet pipe 404 is passed through the inner side of the support ring 406 .

[0030] Specifically, the support ring 406 is coaxially arranged with the inner core 403, and a gap is maintained between two adjacent support rings 406 so that the support ring 406 will not hinder the bending of the core cable 4. The supporting effect of the support ring 406 can offset the pressure exerted by the core head 1 and the airbag 2 on the core cable 4, and prevent the core cable 4 from being deformed, thereby ensuring that the air intake pipe 404 is unobstructed, so as to ensure effective control of the inflation and deflation of the airbag 2.

[0031] A further improvement is, Figure 7 As shown, the end of the air inlet pipe 404 is connected to the first end of the three-way pipe 408 , the second end and the third end of the three-way pipe 408 are both provided with valves 407 , and the valve 407 located on the third end is connected to the air pump 504 .

[0032] Specifically, valve 407 can be a solenoid valve, thereby realizing automatic control switching of valve 407, improving the convenience of equipment use; when the airbag 2 needs to be inflated, valve 407 on the second end of the three-way pipe 408 is closed, and valve 407 on the third end is opened, so that air is inflated into the interior of the airbag 2 through the air pump 504; when the airbag 2 needs to be deflated, valve 407 on the second end of the three-way pipe 408 is opened, and valve 407 on the third end is closed, and under the action of the elasticity of the airbag 2, the air inside the airbag 2 is discharged from the second end; in the above-mentioned core rod, each airbag 2 is respectively connected to an air inlet pipe 404, and each air inlet pipe 404 is connected to a three-way pipe 408, and multiple three-way pipes 408 are connected to the inflation port of the same air pump 504, which can reduce the setting of the air pump and reduce the equipment cost.

[0033] A further improvement is, Figure 8 As shown, an adjustment mechanism 5 is arranged between the end of the core cable 4 away from the limit head 401 and the push rod 3, and the adjustment mechanism 5 is used to adjust the interval between the limit head 401 and the push rod 3; the adjustment mechanism 5 includes a base 501 with one end detachably connected to the push rod 3, and a sliding seat 502 is connected to the base 501 along the axial sliding of the push rod 3. The sliding seat 502 is detachably connected to the core cable 4, and the base 501 is provided with a driving member 503 for driving the sliding seat 502 to move.

[0034] Specifically, the driving member 503 includes a screw rotatably arranged on the base 501 and a motor fixedly connected to the base 501, the motor is connected to the screw in a transmission manner, and the screw is threadedly matched with the sliding seat 502; a guide groove is provided on the base 501, and a slider that slides and cooperates with the guide groove is fixedly connected to the sliding seat 502, and the two cooperate to improve the stability of the movement of the sliding seat 502, and the movement of the sliding seat 502 is powered by the motor and the screw; a slot 505 is fixedly connected to the sliding seat 502, and a plug-in plate 405 is fixedly connected to the end of the core cable 4 away from the limit head 401, and the plug-in plate 405 is plugged and matched with the slot 505 to realize the core cable 4 is a detachable connection between the push rod 3 and the sliding seat 502; one end of the base 501 is fixedly connected with a ring 506, and one end of the push rod 3 is plugged into the ring 506 to achieve a detachable connection between the push rod 3 and the base 501, thereby improving the convenience of equipment maintenance; the air pump 504 is installed on the sliding seat 502 and can move with the sliding seat 502, thereby maintaining relative stillness with the air inlet pipe 404, facilitating the installation and cooperation between the two; when in use, the push rod 3 and the base 501 are relatively still, and the sliding seat 502 pushes the core cable 4 to move, thereby achieving relative movement between the core cable 4 and the push rod 3 to adjust the moving range of the core head 1.

[0035] The base 501 can be installed on a propulsion device on a pipe bending machine for propelling the pipe, so that the core rod can move synchronously with the pipe, thereby effectively controlling the position of the core head 1 inside the pipe and improving the support effect on the pipe.

[0036] A further improvement is, Figure 2 and 6 As shown, the push rod 3 and the limiting head 401 are plugged into and matched with the notch 101 at one end adjacent to the core head 1 .

[0037] Specifically, the push rod 3 and the limit head 401 are plugged into the notch 101 to improve the stability of the connection between the push rod 3 and the limit head 401 and the core head 1, and improve the strength of the core rod when the core rod is in a rigid state.

[0038] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A pipe bending machine core rod structure for electric vehicle frame production, It is characterized in that include: A flexible core cable (4), the front end of the core cable (4) being fixedly connected to a limiting head (401), and an air inlet pipe (404) being arranged inside the core cable (4) along its axial direction; A spherical core head (1) is used to support the pipe from the inside, the core head (1) is provided with a perforated portion (102) along its radial direction, and the core cable (4) is arranged to penetrate the perforated portion (102); an annular airbag (2), the airbag (2) being sleeved on the outer circumference of the core cable (4) and being in communication with the air inlet pipe (404), the airbag (2) and the core head (1) being arranged alternately, and the airbag (2) pushing the core head (1) to move along the axial direction of the tube when inflating or deflation; A tubular push rod (3), the core cable (4) is arranged to penetrate the push rod (3), the air bag (2) and the core head (1) are located between the limit head (401) and the push rod (3), and the limit head (401) and the push rod (3) are used to limit the moving distance of the core head (1).

2. The tube bending machine mandrel structure for electric vehicle frame production according to claim 1, It is characterized in that The core head (1) is provided with notch portions (101) connected to the perforated portion (102) at both ends along the axial direction of the perforated portion (102), wherein the outer diameter of one end is smaller than the inner diameter of the notch portion (101) at the other end.

3. The tube bending machine mandrel structure for producing electric vehicle frames according to claim 2, It is characterized in that Anti-deflection parts are circumferentially distributed on the edges of the openings of the two notches (101), and the anti-deflection parts are arranged to protrude from the spherical surface of the core head (1).

4. The tube bending machine mandrel structure for producing electric vehicle frames according to claim 1, It is characterized in that The core cable (4) comprises an inner core (403) and an outer skin (402) covering the outer surface of the inner core (403), and the air inlet pipe (404) is buried inside the outer skin (402).

5. The tube bending machine mandrel structure for producing electric vehicle frames according to claim 4, It is characterized in that A plurality of support rings (406) are also embedded inside the outer skin (402), each of the support rings (406) being coaxially arranged with the inner core (403) and distributed at equal intervals along the extension direction of the inner core (403), and the air inlet pipe (404) is passed through the inner side of the support ring (406).

6. The tube bending machine mandrel structure for producing electric vehicle frames according to claim 1, It is characterized in that The end of the air inlet pipe (404) is connected to the first end of a three-way pipe (408), and the second end and the third end of the three-way pipe (408) are both provided with valves (407), one of the valves (407) being connected to an air pump (504).

7. The tube bending machine mandrel structure for producing electric vehicle frames according to claim 1, It is characterized in that An adjustment mechanism (5) is provided between the end of the core cable (4) facing away from the limit head (401) and the push rod (3), and the adjustment mechanism (5) is used to adjust the interval between the limit head (401) and the push rod (3).

8. The tube bending machine mandrel structure for producing electric vehicle frames according to claim 7, It is characterized in that The adjustment mechanism (5) comprises a base (501) having one end detachably connected to the push rod (3), a sliding seat (502) being slidably connected to the base (501) along the axial direction of the push rod (3), the sliding seat (502) being detachably connected to the core cable (4), and a driving member (503) for driving the sliding seat (502) to move.

9. The tube bending machine mandrel structure for producing electric vehicle frames according to claim 2, It is characterized in that The push rod (3) and the limiting head (401) are plug-fitted into one end of the core head (1) and the notch (101).

10. The tube bending machine mandrel structure for producing electric vehicle frames according to claim 3, It is characterized in that The anti-deflection member is a ball (103) or a roller.

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